Pump-head-reciprocating mechanism.



WITNESSES:

J. G. DORWARD. f

PUMP HEAD RBGIPROCATING MECHANISM.

APPLICATION FILED JULY l2, 1912.

Patented June 9, 1914 2 SHEETS-SHEET 1.

Jan aru/ure?,

COLUMBIA PLANUURAPH C0., WASHINGTON. D. c.

J. G. DORWARD. PUMP-HBAD REGIPROGATING MEGHANISM. APPLICATION FILED JULY 12,1912.

1,099,874, Patented June 9, 1914.

2 SHEETS-SHEET Z.

WITNESSES:

INVENcpoR l n l I BYfa/lnm COLUMIIA PLANOGIAPH CD.. W ASHINGI0N. D. Cin

JOI-IN G. DORWARD, 0F SA FRANCISCO, CALIFORNIA.

PUMP-HEAD-RECIPROCATING MELI-IANISll/I.`

Specification of Letters Patent.

Patented June 9, 1914.

Application tiled July 12, 1912. Serial No. 708,996.

T0 all @071cm it may concern.'

Be it known that I, JOHN G. DonwAnD, a citizen of the United States, residing in the city and county of San Franciscoand State of California, have invented new and useful Improvements in Pump-Head-Reciproeating Mechanism, o f which the following is a specification.

My invention relates to a device whereby a continuous circular motion may be changed to a reciprocating motion, of any desired length and regularity of stroke, with but little loss of time when the change of direction occurs.

The invention consists in the combination of parts and details ofV construction which will be more fully explained by reference to the accompanying drawings, in which- Figure 1 is a side elevation of the device. Fig. 2 is a plan view of same. Fig.` 3 is an end view showing the driving pinion in position just before passing over to the opposite gear to produce the shifting movement of the shaft. Fig. 4 is a similar view showing the driving pinion in the opposite position and showing the shaft 12 shifted.

It is the object of this invention to transmit power from a continuously rotating power shaft to a reciprocating shaft in such a manner as to produce a regular and even movement of reciprocation from one end to the other of the stroke.

When a crank motion is employed directly, to produce a reciprocation, it will be noted that the up and down motion produced on the quarter stroke of the crank will be of great speed, while the motion transversely of the crank pin will move the reciprocating parts but a short distance; and this varying speed of the reciprocating parts is especially objectionable when the device is used in connection With a pump.

In my invention A- is a. reciprocating member, which may be suitably guided in one or more guides, as at 2, through which the reciprocating member is slidable, and wherein it may be prevented from turning by means of a slot 3 and an engaging feather, or in any other suitable manner.

In the present case I have shown my apparatus as designed to operate a deep well pump, in which the pitman or plunger rod 4 is connected directly with the member A, and is guided to move vertically.

5 and 6 are vertical racks having a length equal to the desired stroke, and intermediate of these racks, at each end, are short sections 7, the teeth of which are transversely in line with the teeth of the racks. These racks are connected at each end with the member A by arms 8 having heads 9, which are turnable about the reciprocating member A; and the racks are fixed on a curve, the radius of which is the center of this reciprocating member.

In order to operate this device, I have shown three pinions 9a, 10, and 11, which are mounted upon a shaft 12. The pinions 91 and 11 are separated so that they may stand in line with, and engage the racks 5 and 6 alternately, as the rack is turned to bring each rack and pinion alternately in line of engagement. The intermediate pinion 10 serves to engage the short intermediate racks 7 during the oscillating movement of the rack, and to insure the proper meshing of the operating gears and pinions, this shaft is journaled horizontally in boxes 13, and may be rotated and is also slidable endwise in said boxes, so that by this sliding movement the pinions 91-10 and 11 will be alternately moved in one direction and the other, a distance equal to the sliding movement of the shaft, and during this movement the rack bars will be turned about their vertical center of motion, so as to cause the pinions to alternately engage with the rack ars.

IThe rotating and reciprocating movement of the shaft 12 is effected by means of two gears 14 and 15, fixed upon the shaft 12 and adapted to mesh with a pinion 1G fixed upon the driving shaft 17, to which a revolving motion is continuously admitted.

The gears 14 and 15 are connected at one point in a diameter, by the intermediate curved toothed segments 18, which form a continuation of each of the gears. rIhese segments 1S stand back to back, as shown,

vso that the toothed interior concaved portions may be engaged by the pinion 16, when by revolution the gears 14 and 15 have completed a revolution in either direction, and the engagement of the pinion with these concaved segments will act to shift the shaft 12, and change the movement of the reciprocating parts, as previously described.

The operation of the device will then be as follows: When the reciprocating racks 5 and 6 are about at the end of their up-stroke, as shown in Fig'. 3, the pinion 9a will be in engagement with the vertical rack 5i The CIK engagement of the pinion 9a with the rack 5 indicates that the shaft 12 is in its righthand shifted position and that it is being rotated by the gears 16 and 14. The pinion 16 being in engagement with the left-hand gear 14, the counter-clockwise rotation of the shaft 17 turns this pinion 16, and this pinion 16 will commence to travel across the concaved toothed segments 18. l/Vhile the pinion 16 is engaging the concaved segments 18, a reversal of rotation to the gears 14 and y15 is obtained. During this engagement of the pinion 16 and the concaved segments 18, an oscillating' movement is transmitted to the shaft 12 and it moves with the gears 14 and 15 to the left; this shifting carrying with it the pinions 9a, 10, and 11, and by reason of their engagement with the lower ends of the racks 5, 6, and 7, and the rack guide disks 10b meshing with the spaces between the racks, it can be seen that the racks will be turned to the left until the pinion 9a is disengaged from its rack 5 and the pinion 10 will engage the short rack 7. This keeps the pinion and rack in alinement and brings the pinion 11 in gear with the rack 6. Just as the pinion 16 is leaving the concaved segment 18 it engages the righthand gear 15 and the constant rotation of the pinion 16 turns the gear 15 until the reciprocating racks have reached the lowest end of their stroke through the engagement of the pinion 11 and the rack 6. At this point the pinion 16 begins to travel across the other concaved segment 18 and leaves the gear 15. This engagement reverses the rotation of the gears 14 and 15 and the shaft 12, and also oscillates or moves these gears 14 and 15 and 'the shaft 12 to the right. While this oscillating movement is taking place, the pinion 11 disengages with the rack 6 and the pinion 10 and the short rack 7 carries the rack until the pinion 9a engages the rack 5. As the pinion 16 is leaving the concaved segment 18, it engages the lefthand gear 14 and by the continual rotation of the pinion 16 it revolves the gears 14 and 15 and the shaft 12, and through the engagement of the pinion 9EL with the rack 5 it coinpletes vthe reciprocation of the up stroke. This completes the operation for one full revolution or stroke of the power head.

From this construction it will be seen that a vcontinued regular rate of rotation of the shaft 17 and the pinion 16, and the engagement of this pinion with the gears 14 or 15, Will produce a steady and regular reciprocation of the part A during the engagement of the pinion 16 with either of the gears 14 or 15; and when the concaved connecting gears have been reached, the movement of the pinion through these gears will cause a rapid shifting 'of the shaft and change of the reciprocating' parts, so that but very little time is consumed in this change. This construction is especially adapted to pumping apparatus where it is desired to obtain a maximum of stroke with a minimum of height of the power head. It will be seen that any desired length of stroke may be obtained by increase in the diameter of the pinions 9a, 10, and 11 and the length of the racks 5-6 and a proportionate size of the gears 14, 15 and 16.

In order to insure a perfect ruiming fit and driving contact between the driving pinion and the gears 14 and 15, I have provided a guide cam or wheel 19 mounted on the shaft centrally between the gears 14 and 15.

Referring to Figs. 1 and 2, it will be seen that the drive-shaft 17 is provided with a roller 2O on its outer end which contacts with the guide wheel or cam. The cam being in contact with the roller will always insure a perfect ruiming contact between the driver 16 and the `gears 14 and 15. The guide wheel is provided with a cut-away portion 21 which registers with the segmental gear connection 18 between the gears 14 and 15, allowing the roller 20 to pass over one side of the cam face to the other while the shaft 12 is being shifted from one side to the other.

In the construction here shown it will be seen that the gears upon the transmission shaft are very nearly complete circles and the short transfer segments from one to the other lie within the curvature and radius of the gears which they connect. The backs or outer peripheries of these segments lie in contact, and a single tangent line drawn between them would be common to both. These segments, when set into the gears on the transmission shaft, form a complete circle and form what might be called a complete circular return rack. This construction insures the greatest possible revolution to the transmission shaft, an even speed continued throughout, and a quick reversal at each end of the revolution. This combination also produces additional power by reason of the driving pinion acting on the periphery of the circular return rack and using the radius of the same as the long arm of a lever and the longitudinally slidable transmission shaft as a fulcrum, andthe pinions forming the short arm acting upon the racks of the pump rod.

Having thus described my invention, what I claim and desire to secure by Letters Patent, iS-

1. In a pumping apparatus of the character described, a driving shaft, a bevel pinion on said driving shaft, a transmission shaft, parallel internally toothed gears on said transmission shaft and provided with internally toothed connecting segments having their outer peripheries contacting and Vforming a complete circular return rack and with which the pinion engages to rotate and reciprocate the transmission shaft, parallel separated racks upon the pump shaft, a pump shaft, pinions upon the transmission shaft alternately engageable with the racks to reciprocate them in opposite directions, an intermediate pinion, and coacting short racks with grooves between these short racks and the parallel racks, and guide disks between the pinions to maintain the racks and pinions in engagement during transfer from one to the other.

2. In a pumping apparatus, a pump rod, a bent yoke swiveled and turnable about the pump rod, a plurality of racks carried by said yoke, a transmission shaft turnable and slidable in bearings, pinions mounted on said shaft and adapted to alternately engage the racks, means to apply power to reciprocate the pump, said means including internally beveled, parallel gears of larger diameter than the rack driving pinions, said gears being united by internally toothed segments, the backs of which contact with a single line tangent to both and form with the gears a circular return rack, a power shaft, and a pinion on said power shaft and engaging said return rack with a leverage greater than that of the rack pinions.

3. In a device of the class described, a continuously rotating power shaft, a pinion upon said power shaft, gear mechanism, a driven shaft carrying said gear mechanism,

said gear mechanism including means connected with said pinion for alternately oscillating and reciprocating said driven shaft, gears carried by said driven shaft, a pump rod, and racks adapted to engage the gears onthe driven shaft, said racks being equidistance from and adpted to be rotated upon said pump rod, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN I-I. I-IERRING, GENEVIEVE S. DONELIN.

Copies of this patent may he obtained for five cents each, 'by addressing the Commissioner of Patents,

Washington, D. C. 

